age=55
# if age<10:
#     print("小孩")
# elif  age>=10 and age<20:
#     print("小朋友")
# elif  age>=20 and age<=30:
#     print("年轻人")
# elif  age>30 and age<=50:
#     print("中年人")
# else:
#     print("老年人")

if age>50:
    print("老年人")
elif age>=30:
    print("中年人")
elif age>=20:
    print("年轻人")
elif age>=10:
    print("小朋友")
else:
    print("小孩")
